While some schools have waivers for an early start, most students will be back in class after Labor Day.

Sanilac County Sheriff Garry Biniecki is reminding drivers there will be plenty of kids in school zones throughout the county.

"With seven public schools in the county, drivers and pedestrians alike need to put their phones away and pay attention to their surroundings," he said in a post on the Sanilac County Sheriff Office's Facebook page.

According to Biniecki, 301 school-age children were killed from 2006 to 2015 in school transportation crashes in the U.S. Of that total, 102 were walkers and eight were riding bicycles, according to data from the U.S. Highway Traffic Safety Administration.

Sanilac deputies will be monitoring school zones, Biniecki said. The sheriff's office also has some safety tips for the school year.

People driving children to school:

Use the appropriate drop-off zone and follow the instructions from school staff

Drive defensively and anticipate the possibility a child could dart in front of your vehicle. Be prepared to stop.

Slow down in school zones and watch out for children walking or cycling to school or gathering at bus stops. Watch for student drivers.

Watch out for buses making frequent stops. It is illegal to pass a stopped school bus picking up or dropping off students.

Watch for pedestrians and yield to them while making turns.

Students riding buses:

Stay out of the street while waiting for the bus and allow the bus to completely stop before approaching from the curb.

Stay in clear view of the driver. Do not walk behind the bus.

Look both ways before getting on the bus and after getting off.

After exiting the bus, look both ways, then immediately move onto the sidewalk and out of traffic.

Students walking or cycling:

Walk on sidewalks and always cross at intersections.

Bike riders always should wear a properly fitting helmet. Riders should have a bike fitted for them and be sure they don't have loose clothing, drawstrings or shoelaces that could be tangled in bicycle chains.

Bike riders should travel on the right, the same direction as traffic, and use appropriate hand signals. Cyclists also should obey traffic lights and stop signs.